docs(cost-tracking): support arbitrary usage types

[hassiebp]

Important

Update documentation to support arbitrary usage types in cost tracking, including renaming usage to usage_details and adding a changelog entry for improved cost tracking.

• Documentation Updates:
  • Rename usage to usage_details in get-started-python-decorator-any-llm.mdx, amazon-bedrock.md, and dspy.md to support arbitrary usage types.
  • Update model-usage-and-cost.mdx to describe new usage and cost tracking capabilities, including arbitrary usage types like cached_tokens, audio_tokens, etc.
• Changelog:
  • Add 2024-12-20-improved-cost-tracking.mdx to document the new feature of improved cost tracking for arbitrary usage types.
• Integration Examples:
  • Update integration examples in google-vertex-ai.md, mistral-sdk.md, and openai/python/assistants-api.md to reflect changes in usage tracking.
• Miscellaneous:
  • Minor updates in sdk/python/example.md and sdk/typescript/example-notebook.md to align with new usage tracking terminology.

^{This description was created by for bab884a. It will automatically update as commits are pushed.}

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New Page Added

The following page was added to the bundle from the code in this PR:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/changelog/2024-12-20-improved-cost-tracking	32.58 KB	366.7 KB	104.77%

One Page Changed Size

The following page changed size from the code in this PR compared to its base branch:

Page	Size (compressed)	First Load	% of Budget (350 KB)
/docs/model-usage-and-cost	36.79 KB	370.91 KB	105.97% (🟡 +0.15%)

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